Ecco Jr.'s Great Ocean Treasure Hunt

Enter the following at the password screen.

Level Password

2 cfr
3 hof
4 rcl
5 slr
6 jho
7 fcj
8 crs
9 ljs
10 roc
11 osh
12 hrl
13 fsl
14 ofj
15 jrf
16 lol
17 flr
18 rhj

At the title screen hold A,B&C until you reach a place called "parents option". There you will find options like level select and much more.